1f6397bac5
For 64 bit the following functional changes are introduced: - .data.page_aligned has moved - .data.cacheline_aligned has moved - .data.read_mostly has moved - ALIGN() moved out of output section for .data.cacheline_aligned - ALIGN() moved out of output section for .data.page_aligned Notice that 32 bit and 64 bit has different location of _edata. .data_nosave is 32 bit only as 64 bit is special due to PERCPU. [ Impact: 32-bit: cleanup, 64-bit: use 32-bit linker script ] Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Cc: Tim Abbott <tabbott@MIT.EDU> Cc: Linus Torvalds <torvalds@linux-foundation.org> LKML-Reference: <1240991249-27117-7-git-send-email-sam@ravnborg.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
205 lines
4.4 KiB
ArmAsm
205 lines
4.4 KiB
ArmAsm
/*
|
|
* ld script for the x86 kernel
|
|
*
|
|
* Historic 32-bit version written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
|
|
*
|
|
* Modernisation and unification done by Sam Ravnborg <sam@ravnborg.org>
|
|
*
|
|
*
|
|
* Don't define absolute symbols until and unless you know that symbol
|
|
* value is should remain constant even if kernel image is relocated
|
|
* at run time. Absolute symbols are not relocated. If symbol value should
|
|
* change if kernel is relocated, make the symbol section relative and
|
|
* put it inside the section definition.
|
|
*/
|
|
|
|
#ifdef CONFIG_X86_32
|
|
#define LOAD_OFFSET __PAGE_OFFSET
|
|
#else
|
|
#define LOAD_OFFSET __START_KERNEL_map
|
|
#endif
|
|
|
|
#include <asm-generic/vmlinux.lds.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/thread_info.h>
|
|
#include <asm/page_types.h>
|
|
#include <asm/cache.h>
|
|
#include <asm/boot.h>
|
|
|
|
#undef i386 /* in case the preprocessor is a 32bit one */
|
|
|
|
OUTPUT_FORMAT(CONFIG_OUTPUT_FORMAT, CONFIG_OUTPUT_FORMAT, CONFIG_OUTPUT_FORMAT)
|
|
|
|
#ifdef CONFIG_X86_32
|
|
OUTPUT_ARCH(i386)
|
|
ENTRY(phys_startup_32)
|
|
jiffies = jiffies_64;
|
|
#else
|
|
OUTPUT_ARCH(i386:x86-64)
|
|
ENTRY(phys_startup_64)
|
|
jiffies_64 = jiffies;
|
|
#endif
|
|
|
|
PHDRS {
|
|
text PT_LOAD FLAGS(5); /* R_E */
|
|
data PT_LOAD FLAGS(7); /* RWE */
|
|
#ifdef CONFIG_X86_64
|
|
user PT_LOAD FLAGS(7); /* RWE */
|
|
data.init PT_LOAD FLAGS(7); /* RWE */
|
|
#ifdef CONFIG_SMP
|
|
percpu PT_LOAD FLAGS(7); /* RWE */
|
|
#endif
|
|
data.init2 PT_LOAD FLAGS(7); /* RWE */
|
|
#endif
|
|
note PT_NOTE FLAGS(0); /* ___ */
|
|
}
|
|
|
|
SECTIONS
|
|
{
|
|
#ifdef CONFIG_X86_32
|
|
. = LOAD_OFFSET + LOAD_PHYSICAL_ADDR;
|
|
phys_startup_32 = startup_32 - LOAD_OFFSET;
|
|
#else
|
|
. = __START_KERNEL;
|
|
phys_startup_64 = startup_64 - LOAD_OFFSET;
|
|
#endif
|
|
|
|
/* Text and read-only data */
|
|
|
|
/* bootstrapping code */
|
|
.text.head : AT(ADDR(.text.head) - LOAD_OFFSET) {
|
|
_text = .;
|
|
*(.text.head)
|
|
} :text = 0x9090
|
|
|
|
/* The rest of the text */
|
|
.text : AT(ADDR(.text) - LOAD_OFFSET) {
|
|
#ifdef CONFIG_X86_32
|
|
/* not really needed, already page aligned */
|
|
. = ALIGN(PAGE_SIZE);
|
|
*(.text.page_aligned)
|
|
#endif
|
|
. = ALIGN(8);
|
|
_stext = .;
|
|
TEXT_TEXT
|
|
SCHED_TEXT
|
|
LOCK_TEXT
|
|
KPROBES_TEXT
|
|
IRQENTRY_TEXT
|
|
*(.fixup)
|
|
*(.gnu.warning)
|
|
/* End of text section */
|
|
_etext = .;
|
|
} :text = 0x9090
|
|
|
|
NOTES :text :note
|
|
|
|
/* Exception table */
|
|
. = ALIGN(16);
|
|
__ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
|
|
__start___ex_table = .;
|
|
*(__ex_table)
|
|
__stop___ex_table = .;
|
|
} :text = 0x9090
|
|
|
|
RODATA
|
|
|
|
/* Data */
|
|
. = ALIGN(PAGE_SIZE);
|
|
.data : AT(ADDR(.data) - LOAD_OFFSET) {
|
|
DATA_DATA
|
|
CONSTRUCTORS
|
|
|
|
#ifdef CONFIG_X86_64
|
|
/* End of data section */
|
|
_edata = .;
|
|
#endif
|
|
} :data
|
|
|
|
#ifdef CONFIG_X86_32
|
|
/* 32 bit has nosave before _edata */
|
|
. = ALIGN(PAGE_SIZE);
|
|
.data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
|
|
__nosave_begin = .;
|
|
*(.data.nosave)
|
|
. = ALIGN(PAGE_SIZE);
|
|
__nosave_end = .;
|
|
}
|
|
#endif
|
|
|
|
. = ALIGN(PAGE_SIZE);
|
|
.data.page_aligned : AT(ADDR(.data.page_aligned) - LOAD_OFFSET) {
|
|
*(.data.page_aligned)
|
|
*(.data.idt)
|
|
}
|
|
|
|
#ifdef CONFIG_X86_32
|
|
. = ALIGN(32);
|
|
#else
|
|
. = ALIGN(PAGE_SIZE);
|
|
. = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
|
|
#endif
|
|
.data.cacheline_aligned :
|
|
AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET) {
|
|
*(.data.cacheline_aligned)
|
|
}
|
|
|
|
/* rarely changed data like cpu maps */
|
|
#ifdef CONFIG_X86_32
|
|
. = ALIGN(32);
|
|
#else
|
|
. = ALIGN(CONFIG_X86_INTERNODE_CACHE_BYTES);
|
|
#endif
|
|
.data.read_mostly : AT(ADDR(.data.read_mostly) - LOAD_OFFSET) {
|
|
*(.data.read_mostly)
|
|
|
|
#ifdef CONFIG_X86_32
|
|
/* End of data section */
|
|
_edata = .;
|
|
#endif
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_X86_32
|
|
# include "vmlinux_32.lds.S"
|
|
#else
|
|
# include "vmlinux_64.lds.S"
|
|
#endif
|
|
|
|
STABS_DEBUG
|
|
DWARF_DEBUG
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_X86_32
|
|
ASSERT((_end - LOAD_OFFSET <= KERNEL_IMAGE_SIZE),
|
|
"kernel image bigger than KERNEL_IMAGE_SIZE")
|
|
#else
|
|
/*
|
|
* Per-cpu symbols which need to be offset from __per_cpu_load
|
|
* for the boot processor.
|
|
*/
|
|
#define INIT_PER_CPU(x) init_per_cpu__##x = per_cpu__##x + __per_cpu_load
|
|
INIT_PER_CPU(gdt_page);
|
|
INIT_PER_CPU(irq_stack_union);
|
|
|
|
/*
|
|
* Build-time check on the image size:
|
|
*/
|
|
ASSERT((_end - _text <= KERNEL_IMAGE_SIZE),
|
|
"kernel image bigger than KERNEL_IMAGE_SIZE")
|
|
|
|
#ifdef CONFIG_SMP
|
|
ASSERT((per_cpu__irq_stack_union == 0),
|
|
"irq_stack_union is not at start of per-cpu area");
|
|
#endif
|
|
|
|
#endif /* CONFIG_X86_32 */
|
|
|
|
#ifdef CONFIG_KEXEC
|
|
#include <asm/kexec.h>
|
|
|
|
ASSERT(kexec_control_code_size <= KEXEC_CONTROL_CODE_MAX_SIZE,
|
|
"kexec control code size is too big")
|
|
#endif
|
|
|